Source : Webster's Revised Unabridged Dictionary (1913)

Vertically \Ver"ti*cal*ly\, adv.
   In a vertical manner, position, or direction;
   perpendicularly; as, to look down vertically; to raise a
   thing vertically.

Source : WordNet®

vertically
     adv : in a vertical direction; "a gallery quite often is added to
           make use of space vertically as well as horizontally"